Expressions can be any Python expression, including function calls. Template code is executed in a namespace that includes the following objects and functions. (Note that this list applies to templates rendered include ... %} directive, template modules have a distinct namespace from their containing template - they can only see the global template namespace and their own keyword arguments. 6.1. User’s guide 31Tornado response, use render() above. RequestHandler.get_template_namespace() → Dict[str, Any] Returns a dictionary to be used as the default template namespace. May be overridden by subclasses to add or modify values

Expressions can be any Python expression, including function calls. Template code is executed in a namespace that includes the following objects and functions. (Note that this list applies to templates rendered include ... %} directive, template modules have a distinct namespace from their containing template - they can only see the global template namespace and their own keyword arguments.Authentication and security RequestHandler.finish() RequestHandler.render() RequestHandler.render_string() RequestHandler.get_template_namespace() RequestHandler.redirect()RequestHandler.send_error() RequestHandler.write_error() RequestHandler

CurveFS kv方案设计 curve实现块设备时，元数据不是扁平化的设计，而是采用来有目录层级的 namespace 方式，namespace 已经实现了 fs 元数据管理的雏形，具备了基本的元数据管理功能。（当时为什么要设计为 namespace 的管理形式？留有租户这个概念），直接基于 namespace 开发： a. 功能 软/硬链接：目前是都不支持的。软链接可以通过标识文件类型解决；由于

pool1 type: 0 replicasnum: 3 copysetnum: 100 zonenum: 3 scatterwidth: 0NAMESERVER NameServer管理namespace元数据信息，包括（更具体的信息可以查看curve/proto/nameserver2.proto）： • FileInfo: 文件的信息。 • PageFileSegment: segment是给文件分配空间的最小单位 segment是给文件分配空间的最小单位 。 • PageFileChunkInfo: chunk是数据分片的最小单元。 segment 和 chunk的关系如下图:NAMESERVER Namespace的文件的目录层次关系如右图。 文件的元数据以KV的方式存储。 • Key：ParentID + “/”+ BaseName； • Value：自身的文件ID。 这种方式可以很好地平衡几个需求： •

如果pathname是一个符号链接，则会打开失败（ELOOP） : 不更新Inode中的last access time（进程uid=文件uid或者进程在它的user namespace有CAP_FOWNER, 而文件的uid在这个namespace中有一个映射）。 O_NOATIME : 在进程执行exec系统调用时关闭此打开的文件描述符，防止父进程泄露打开的文件给子进程。 O_CLOEXEC O_PATH:

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201 16 Modules 205 16.1 Namespace management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206 16.2 Submodules and statements or through qualified access using the dot-notation, i.e. each module is a so-called namespace as well as a first-class data structure associating names with values. If a top-level expression module, you have to import it or use the name qualified with module names. See the section on namespace management. 12.1 Defining Methods Until now, we have, in our examples, defined only functions

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201 16 Modules 205 16.1 Namespace management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206 16.2 Submodules and statements or through qualified access using the dot-notation, i.e. each module is a so-called namespace as well as a first-class data structure associating names with values. If a top-level expression module, you have to import it or use the name qualified with module names. See the section on namespace management. 12.1 Defining Methods Until now, we have, in our examples, defined only functions

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213 17 Modules 218 17.1 Namespace management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219 17.2 Submodules and statements or through qualified access using the dot-notation, i.e. each module is a so-called namespace as well as a first-class data structure associating names with values. If a top-level expression module, you have to import it or use the name qualified with module names. See the section on namespace management. 13.1 Defining Methods Until now, we have, in our examples, defined only functions

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213 17 Modules 218 17.1 Namespace management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219 17.2 Submodules and statements or through qualified access using the dot-notation, i.e. each module is a so-called namespace as well as a first-class data structure associating names with values. If a top-level expression module, you have to import it or use the name qualified with module names. See the section on namespace management. 13.1 Defining Methods Until now, we have, in our examples, defined only functions

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213 17 Modules 218 17.1 Namespace management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219 17.2 Submodules and statements or through qualified access using the dot-notation, i.e. each module is a so-called namespace as well as a first-class data structure associating names with values. If a top-level expression module, you have to import it or use the name qualified with module names. See the section on namespace management. 13.1 Defining Methods Until now, we have, in our examples, defined only functions